The production of citric and gluconic acids from fig by Aspergillus niger ATCC 10577 in solid-state fermentation was investigated. The maximal citric and gluconic acids concentration (64 and 490 g/kg dry figs, respectively), citric acid yield (8%), and gluconic acid yield (63%) were obtained at a moisture level of 75%, initial pH 7.0, temperature 30°C, and fermentation time in 15 days. However, the highest biomass dry weight (40 g/kg wet substrate) and sugar utilization (90%) were obtained in cultures grown at 35°C. The addition of 6% (w/w) methanol into substrate increased the concentration of citric and gluconic acid from 64 and 490 to 96 and 685 g/kg dry fig, respectively. Journal of Industrial Microbiology & Biotechnology (2000) 25, 298–304.
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Received 15 April 2000/ Accepted in revised form 11 August 2000
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Roukas, T. Citric and gluconic acid production from fig by Aspergillus niger using solid-state fermentation. J Ind Microbiol Biotech 25, 298–304 (2000). https://doi.org/10.1038/sj.jim.7000101
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DOI: https://doi.org/10.1038/sj.jim.7000101